Backpack



FIG. 1 is a front perspective view of a backpack;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a front perspective view of a backpack in an open configuration to reveal an interior of the backpack;

FIG. 10 is a front elevational view thereof;

FIG. 11 is a right side elevational view thereof;

FIG. 12 is a rear elevational view thereof;

FIG. 13 is a left side elevational view thereof;

FIG. 14 is a top plan view thereof; and,

FIG. 15 is a bottom plan view thereof.

The broken line showing of straps and dividers is included for the purpose of illustrating environmental structure and forms no part of the claimed design. 

CLAIM The ornamental design for a backpack, as shown and described. 